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Debt - Redemption Price as Percentage of Principal Amount to Applicable Date of Redemption (Detail) (Senior Notes [Member])
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12 Months Ended |
|---|---|
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Dec. 31, 2014
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12-Month Period Commencing August 1 in Year 2015 [Member]
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| Debt Instrument, Redemption [Line Items] | |
| Redemption price percentage | 104.375% |
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12-Month Period Commencing August 1 in Year 2016 [Member]
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| Debt Instrument, Redemption [Line Items] | |
| Redemption price percentage | 102.188% |
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12-Month Period Commencing August 1 in Year 2017 and Thereafter [Member]
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|
| Debt Instrument, Redemption [Line Items] | |
| Redemption price percentage | 100.00% |